Method for preparing cellulose base carbon fiber felt through low-temperature alkali urea treatment

A technology of cellulose fiber and carbon-based fiber, which is applied in the direction of artificial filament in cellulose solution, fiber chemical characteristics, rayon manufacturing, etc., can solve the problems of environmental pollution, high energy consumption, long process route, etc., and achieve easy recycling , Overcoming the effect of easy gelation and simple process

Inactive Publication Date: 2016-12-21
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The problem to be solved by the present invention is that the preparation method of the existing carbo

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1

[0025] A method for preparing cellulose-based carbon fiber felt by a low-temperature alkaline urea method, including the following steps:

[0026] Add 0.7g of water-soluble carbon black while stirring into 930g of 3wt%-20wt% sodium hydroxide / 3wt%-15wt% urea / 3wt%-15wt% thiourea aqueous solution to obtain alkali composite / carbon black aqueous solution; The dried cellulose cotton pulp powder with a degree of polymerization of 600 is dispersed in the above alkali composite / carbon black aqueous solution, stirred at high speed to form a suspension, and enters the pre-frozen twin screw. The twin screw speed is 200 rpm and the temperature in each zone is -4 ℃~2℃; After dissolving at low temperature and high shear in twin screw extruder, 7wt% of uniform and stable cellulose alkali composite / carbon black solution is obtained; after filtration and defoaming, the precursor fiber of cellulose-based carbon fiber is obtained. Silk dope: Extrude the spinning dope through a 0.01...

Example Embodiment

[0027] Example 2

[0028] A method for preparing cellulose-based carbon fiber felt by a low-temperature alkaline urea method, including the following steps:

[0029] Add 100g of water-soluble carbon black while stirring into 700g of 3wt%-20wt% sodium hydroxide / 3wt%-15wt% urea / 3wt%-15wt% thiourea aqueous solution to obtain alkali composite / carbon black aqueous solution; 200g has been dried The cellulose cotton pulp powder with a degree of polymerization of 300 is dispersed in the above alkali composite / carbon black aqueous solution, stirred at high speed to form a suspension, and enters the pre-frozen twin screw. The twin screw speed is 500rpm and the temperature in each zone is -4℃ ~2℃; 20wt% uniform and stable cellulose alkali composite / carbon black solution is obtained after low-temperature and high-shear dissolution in a twin-screw extruder; after filtration and defoaming, the precursor fiber of cellulose-based carbon fiber is obtained. Dope: Extrude the spinning dope through a...

Example Embodiment

[0030] Example 3

[0031] A method for preparing cellulose-based carbon fiber felt by a low-temperature alkaline urea method, including the following steps:

[0032] Add 37.5g of water-soluble carbon black while stirring into 812.5g of 3wt%-20wt% sodium hydroxide / 3wt%-15wt% urea / 3wt%-15wt% thiourea aqueous solution to obtain alkali composite / carbon black aqueous solution; The dried cellulose cotton pulp powder with a degree of polymerization of 500 is dispersed in the above alkali composite / carbon black aqueous solution, stirred at high speed to form a suspension, and enters the pre-frozen twin screw. The twin screw speed is 400 rpm and the temperature in each zone is- 4℃~2℃; after low temperature and high shear dissolution in twin screw extruder, 15wt% uniform and stable cellulose alkali composite / carbon black solution is obtained; after filtration and deaeration, the precursor fiber of cellulose-based carbon fiber is obtained Spinning dope: Extrude the spinning dope through a 0....

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Abstract

The invention discloses a method for preparing cellulose-based carbon fiber felt by low-temperature alkali urea method. The cellulose pulp is stirred at room temperature in a solvent composition of sodium hydroxide, urea, thiourea, water-soluble carbon black and water to prepare the felt. The cellulose suspension is obtained, and then enters the pre-frozen twin-screw extruder to obtain a black cellulose solution, which is finally filtered and defoamed and sprayed into a coagulation bath for spinning, and further washed, drawn, and oiled and drying to obtain cellulose fibers; the cellulose fibers are processed into cellulose fiber mats through a needle-punched non-woven process, and further catalyzed impregnation, pre-oxidation, and carbonization to obtain cellulose-based carbon fiber mats. The process of the invention is simple, the solvent used is green and environmentally friendly, the price is low, and the recovery rate is high. The spun cellulose fiber has a compact structure, good thermal stability, and ablation resistance. The processed cellulose-based carbon fiber felt is better than that without carbon black. Carbon fiber felt has a higher carbon yield.

Description

technical field [0001] The invention discloses a method for preparing a carbon fiber felt, in particular a process for spinning a cellulose-based carbon fiber felt with a cellulose alkali composite / carbon black solution. Background technique [0002] According to the raw materials, carbon fiber felt mainly includes viscose-based carbon fiber felt, polyacrylonitrile-based carbon fiber felt and pitch-based carbon fiber felt. As a high-temperature heat insulation material in aerospace, medical, national defense, steel, chemical and other industries, it has huge applications. potential. Since PAN-based carbon fiber felt has an absolute advantage in terms of comprehensive performance and sales, researchers have conducted a lot of scientific research on PAN used in carbon fiber felt and formed many patents. However, polyacrylonitrile is derived from petroleum or the by-products of petroleum decomposition. Due to the scarcity of petroleum resources, it is very necessary to explore...

Claims

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Application Information

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IPC IPC(8): D04H1/4382D04H1/4242D04H1/425D06C7/04D01F9/16D01F2/02D01F1/10
CPCD04H1/4382D01F1/10D01F2/02D01F9/16D04H1/4242D04H1/425D06C7/04
Inventor 余木火杨燕平张玥邓雅
Owner DONGHUA UNIV
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